Figure 2. Boxplot of the quantifications of the Chlamydia pneumoniae–positive PCRs, by sample type, in a tertiary care hospital, Lausanne, Switzerland. In total, 24 nasopharyngeal swab and 5 sputum samples were available. For 2 patients, data were paired, with 1 nasopharyngeal swab and 1 sputum sample available for each. Black dots indicate individual samples; horizontal lines within boxes indicate medians; box tops and bottoms indicate interquartile range; and error bars indicate 1.5 times the value of the interquartile ranges. The nostril swab was omitted from the analysis. We observed no statistically significant difference between the groups (Wilcoxon rank-sum test).